We are currently experiencing an outage with RingCentral Connect. Our app just started getting a content-type is not defined error message whenever trying to send a Fax using the RingCentral Connect API. This has happened twice before (August 2016) was the last time and both times it was due to an outage on your end. We haven't changed anything on our end and it was working last night. I really with there was someone I could call when we have a problem like this but the phone support team doesn't seem to even know that RingCentral has Developer tools.
I have acknowledged that I am seeing this same issue in Production for all non-oauth endpoints (but not seeing this in my Sandbox Account). I've escalated this to our engineering team for immediate investigation.
Could those reporting or commenting please reply if they are seeing this only on non-oauth endpoints in production (or if you're seeing this in the sandbox as well) please?